Utility knife



FIG. 1 is a perspective view of a utility knife showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view therefor;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a right-side view thereof; and,

FIG. 7 is a left-side view thereof.

The broken lines depict portions of the utility knife in which thedesign is embodied that are not considered part of the claimed design.

CLAIM The ornamental design for a utility knife, as shown and described.